The Sidereal Zodiac system is based the true position of Fixed Star constellations (which move approx 1 degree every 72 years) and the Precession of the Equinoxes.
In the guidance I downloaded on working with uniting souls into Tao Partnerships I received the information that each person in the couple must have their Rising (ASC) Sign within either the Atmospheric (Organic) or Salt (Sea Water) Cross* as seen in the below diagrams.
To check if your Ascendant / Rising Sign please go to Astrodienst. Create a login then add your birth data (you need an accurate time to get your rising sign). After you have your details saved go to the "extended chart selection" option on their menu, select your name, then choose natal chart wheel, web default for chart selection, leave the current date in place. Opt for sidereal, whole house, Hindu/Lahiri, Geocentric and click show chart. Here is an example of a Leo Rising (me!)
Those of you who have your Ascendant / Rising Sign in the Mineral Cross below it seems are not destined to be united with your "Twin Flame" in this incarnation but with a soul mate. Your mission is still to bring Heaven to Earth as we are all here to do that! I am offering the free monthly YouTube Astro healings for you too, just not the one to one work as I have been guided that my current mission is to primarily focus on helping the Tao Partnerships.
* The Zodiac Crosses are discussed in Yvan Rioux's The Mystery of Emerging Form: Imma von Eckardstein's Drawings of the Constellations - A Biological Perspective, Temple Lodge, 2017.